Oil-pressure pump



Oct. 12 1926.

E. WOERNER on. razssunm PUMP Filed Dec. 20. 1923 2 Sheets-Sheet 1 fi -Q.

E. WOERNER' OIL PRESSURE PUMP Filed Dec. 20. 1923 2 Sheets-Sheet 2Patented Oct. 12, 1926. I

UNITED STATES [PATENT OFFICE.

EUGEN WOER NER, OF STUTTGART, GERMANY.

OIL-PRESSURE PUMP.

v Application filed December 20, 1923. Serial No, 681,799.

equal circumferential parts of the inclined a helical line.

disk which revolves with uniform speed. A uniform delivery is howeververy important as only in this case, the lubricating can be mosteconomical and at the same time very effective. An inclined diskpresents further the inconvenience that suction stroke and pressurestroke are necessarily equal. One half of each revolution of the drivingdisk is therefore lost for the delivery or for the uniformity of 'thesame. I

According to this invention in order to avoid the first mentionedinconvenience of the inclined disk the driving disk is of such a shapethat the part of its circumference which produces the, pressure strokeforms second mentioned inconvenience the part of the driving disk whichcorresponds with the suction stroke and which is ascending andpreferably forms also a helical line is shorter and steeper than thedescending part which corresponds with the pressure stroke.

The helical line shaped construction of the driving element for pumppistons, on said part of the circumference of the driving element whichcorresponds to the pressure stroke as well as on the part correspondingto the suction stroke, is known, but only for. pumps .of another type.The use of the helical line shaped construction of the driving elementin pumps of the type in question means, however, for these pumps, aconsiderable rogress as mentioned above and as willbe urther explained.at the end of the specification.

The invention will be best understood from a consideration of thefollowing detailed description taken in connection with the accompanyingdrawings forming a part of this specification, with the understandingthat while on the drawings one embodiment of the invention is disclosed,the invention is not confined to any strict conformity with the showingof the drawings, but may be embodied inany manner which does not make amaterial departure from the salient features of the invention.

In the drawings Fig. 1 is. a longitudinal section, and

With a view to avoid the.

Fig. 2 is a cross section showing the'improved driving disk.

Fig. 3- is a development of the driving disk. 7

Fig. 4 illustrates the evolution and peculiarity of the improved drivingdisk compared with the inolined disk.

Fig. 5 shows in operating the valve.

Fig. 6 shows the cam and a valve in vertical section.

Fig. 7 shows in vertical-section a modi fied construction of the valveoperating means.

The driving shaft 3 is journaled in the bottom of the casing 1 and inthe top plate 2 of the same. On this'shaft 3 the driving disk 4: and thecam 5 for the inlet valves of the pump are keyed. The pump bodies 7arranged in a circle around the driving shaft are mounted on asupporting ring 6 which is loosely mounted on the driving shaft. Thepump pistons 8 engage in the well known manner, by means of a projectionsimilar to a crank shaft, over the driving disk a and rest upon thelatter through the intermediary of adjusting screws 9 which are guidedin the lid 2 of the casing and which are designed to determine thepiston stroke. The oil is admitted into the casing 1 through the hood 10and the aperture 11 of the lid 2 and it flows through the passages 17under the suction valves 15 and pressure springs 18 to flow out of thepump bodies through the pressure valves 13 wit pressure springs 14 andthe pressure pipes plan view the cam for a suction stroke takes place,when the shaft is rotating, only over a short part 8 of the totalcircumference of the driving disk t, the remaining part (2 of thecircumference of said disk being at disposal for the pressure stroke.The cam 5 is mounted on the driving shaft with regard to the drivingwheel 4: in such a position and it is of such of the working rim of theinclined disk and if a point of the circumference of this disk moves, atthe rotation of the disk, successively over the sections a of thecircumference of said disk in the direction of the arrow, from thestarting point 0 of the movement, will correspond to the ordinateserected at the end points of the perpendiculars at the ends of thesections a on the axis of abscissae O and reaching up to line B. Thedifferences a, a, a? of these ordinates indicate that the piston strokeis not uniform over the several uniform sections a of the circumferenceof the inclined disk but extends along a sine-line D.

Example: At a stroke extending over 300 of. the circumference of thewheel similar quantities of oil have to be delivered for every 30 or forequal center angles. In the oil pump described this is obtained bymaking the heights of the stroke for the first 30 and for all thefollowing 30, e. g. for all angles, accurately equal, e. g. a a, a andso forth are of the same height whereby the delivery of an equalquantity of oil is ensured.

r The quantities of lubricant delivered during the several sections ofthe entire pressure stroke 0 are therefore unequal; however, in order.to attain a uniform pres sure stroke over every section a of thecirpoints of the correspondin cumference always the same strokedifference b is traced on the next following ordinate acurve E isobtained which rep-- resents a helicalline according to which the newdriving elementis shappd. In this case the pressure stroke, is equa ygreat over all its time sections and the quantity: delivered isabsolutely uniform; during {the pressure stroke. A curve F laid throngordinate-differences shows the steady, um of the pistons incontradistinction to the irregular line of acceleration D of theinclined disk. The helical elevation line E correspondsto the straightlined progress of the working surface in the development in Fig. 3, butin opposition to. thelatter it is supposed in Fig. 4 that the suctionstroke of the driving disk and the-pressure stroke extend each over onehalf of the circumference'ofthe disk. If. the suction stroke is selectedshorter and steeper a much more uniform distribution of the oil deliveryredriving the total stroke of said point, cdunted shorter and h the endrm accelerationsults withfregard to 'the entire circumference..

acting element of convenient construction is used in this case as shownin Fig.7.

I claim;- 1. An oil pump comprising in combination pump cylindersarranged in a clrcle, pistons in. said cylinders, and a common of saiddriving disk which corresponds with the pressure stroke presenting theform )of a helical line. i v 2. An oil pump comprising in combinationpump cylindersarranged in a circle, pistons in said cylinders, and acommon drivmi disk the part of, the circumference of sai driving diskwhich corresponds with the pressure stroke presenting the form of aheli-' cal line and that part which. corresponds with the suction strokeand which is ascending' extending preferably also in a helical line butbeing shorter and steeperthan the dedisk the part of the circumferencescending part which corresponds with the pressure stroke.

3. An oil pump of the type described comprising in' combination a l tonsarranged in a circle, a common disk for operating said pistons thedescending part of the circumference of said disk which cor- .respondswith the pressure stroke being in the shape of the helical line and thedescending part of the circumference of "said disk which correspondswith the suction stroke being also in the shape of aheli cal line butsteeper than the descendingpart, andpositively controlled spring loadedf valves for controlling the admission. of lubricant into the pumpcylinder, and valves for controlling the outflow of lubricant from thepump cylinder. I

4.. An oil pump of the type described comprising in combination a pumpcylinder, pistons arranged in a circle, a common disk for operating saidpistons-the descending part of the circumference of said disk whichcorresponds with the pressure stroke being in the shape of thehelical-line and the descending part of the circumference of said diskwhich corresponds with the suction stroke being also in the shape of ahelical line but shorter and steeper than the descending part,

positively controlled spring loaded valves for controlling the admissionof lubricant into the pump cylinder, and valves for controlling theoutflow of lubricant from the pump cylinder, a driving shaft, a cam diskrotating with said ment of said cam disk desi ed to control the inletvalves and situated in the area of thesuction stroke of the pistons.

In testimonywhereof I aflix my signature.

EUGEN WOERNER.

pump cylinder,'pisdIlVlIlg shaft, and a seg- 3

